How can i retrieve recodes in txtfile like in database

I want to store three values into textfile, every time, when i press button, i will add values into textfile, and when i add value a, i can compare the exisitng value in textifile with value a. just operating like in database.
How can i do like. is there anyone provide codes for me,

i mean that if i want to put a new value into text
file. i first check whether there is a value in the
textfile is the same with the value i put. just like
retrieve in database.Hint: RandomAccessFile

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How can i retrieve recodes in txtfile like in database

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